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WO2009115418A1 - Dispositif de détection de fuite sur un navire - Google Patents

Dispositif de détection de fuite sur un navire Download PDF

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Publication number
WO2009115418A1
WO2009115418A1 PCT/EP2009/052704 EP2009052704W WO2009115418A1 WO 2009115418 A1 WO2009115418 A1 WO 2009115418A1 EP 2009052704 W EP2009052704 W EP 2009052704W WO 2009115418 A1 WO2009115418 A1 WO 2009115418A1
Authority
WO
WIPO (PCT)
Prior art keywords
bilge
optical waveguide
liquid level
bragg gratings
signal processing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2009/052704
Other languages
German (de)
English (en)
Inventor
Thomas Bosselmann
Dierk SCHRÖDER
Rainer Hartig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to ES09721552.9T priority Critical patent/ES2525131T3/es
Priority to EP09721552.9A priority patent/EP2255163B1/fr
Publication of WO2009115418A1 publication Critical patent/WO2009115418A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms
    • G01F23/2925—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms using electrical detecting means
    • G01F23/2927—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms using electrical detecting means for several discrete levels, e.g. with more than one light-conducting sensing element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
    • G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
    • G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
    • G01D5/35354—Sensor working in reflection
    • G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35383—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques
    • G01D5/35387—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques using wavelength division multiplexing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/042—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid
    • G01M3/045—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid with electrical detection means
    • G01M3/047—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid with electrical detection means with photo-electrical detection means, e.g. using optical fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B2043/006—Methods or installations specially adapted for detecting ingress of ambient water, e.g. leak detectors

Definitions

  • the invention relates to a device for detecting leaks on a ship according to the preamble of claim 1.
  • Bilgebrunnen i. Recessing zones equipped with relatively small lateral dimensions. Even in the presence of a relatively small amount of liquid, a noticeable height of the liquid level above the ground results in these bilge wells. In the Bilgebrunnen sensors are attached, which detect the liquid level.
  • two or three sensors are installed in a bilge fountain to detect leaks. These are connected by cables to the on-board computer system. For larger vessels this means a high cabling effort, as numerous bilge fountains are distributed over the entire lower area of the ship.
  • a sensor consisting of an optical waveguide is used for leak detection on a ship, along which a plurality of Bragg gratings with mutually different grating periods are formed at predetermined positions.
  • the signal processing device assigned to the sensor has a light source suitable for the irradiation of light into the optical waveguide and an analyzer suitable for the spectral analysis of the light backscattered at the Bragg gratings.
  • the optical waveguide is arranged in a bilge such that the number of Bragg gratings located below the liquid level of a liquid contained in the bilge depends on the level of liquid in the bilge.
  • a change in temperature causes a shift of the characteristic wavelength backscattered at a Bragg grating. From the wavelength shift it can be concluded via the temperature change whether or not a region of the optical waveguide provided with a Bragg grating is surrounded by liquid or not, when the liquid has a temperature deviating from the ambient. Otherwise, a temperature change as a result of a layer immersed in a liquid of a region of the optical waveguide can be brought about by heating the entire optical waveguide. In this case, the increased heat dissipation through the liquid causes a temperature drop of the immersed area.
  • the optical waveguide in the bilge is arranged such that the number of Bragg gratings located below the liquid level of a liquid contained in the bilge depends on the liquid level in the bilge. This enables a measurement of the liquid level, whereby the dissolution given by the number of Bragg gratings and their distances.
  • Particularly expedient is the arrangement of a provided with at least one Bragg grating portion of the optical waveguide in a bilge formed in the bilge wells, in which adjusts even with a small amount of liquid, a liquid level of appreciable height above the ground.
  • the course of the optical waveguide, preferably in the form of a fiber optic cable, in the bilge or in the bilge fountain can be predetermined by a carrier body, along which the fiber optic cable is guided. It is also possible to insert the fiber into a pre-installed case. This has the advantage that, if necessary, the glass fiber, i. if a defect occurs, can be replaced without media contact. Furthermore, it is possible to install such cases for reference measurements. Due to the small thickness of glass fibers and their great flexibility, they can be installed much more easily than conventional measuring arrangements even under difficult spatial conditions.
  • a single fiber optic cable assumes the function of a plurality of individual sensor elements both through the Bragg grating incorporated therein and at the same time as a connecting line between the individual sensor elements and the signal processing device.
  • this connection line is not star-shaped, but the individual sensor elements and the signal processing means are arranged on it as a bus line and the communication between each sensor element and the signal processing means takes place simultaneously in the frequency multiplexing.
  • the use of an optical waveguide as a sensor therefore makes it possible to enormously reduce the wiring complexity in comparison with the prior art. It is also possible to lay a single optical fiber in succession through several Bilgebrunnen and reduce the cabling effort in this way even further.
  • Another advantage of the invention is the insensitivity of fiber optic cables to interference from electromagnetic interference, a problem that is increasingly prevalent in modern shipbuilding.
  • Fig.l is a schematic rear view of a ship
  • FIG. 3 is a schematic plan view of the ship of Fig. 1,
  • FIG. 5 shows a part of the bilge of FIG. 4 in a plan view
  • FIG. 6 shows the schematic structure of a leakage sensor system according to the invention
  • FIG. 9 shows the functional principle of a sensor according to the invention and 10 shows an inventive arrangement of a plurality of interconnected leakage sensors.
  • Figures 1 to 3 show the example of a ferry 1 the order of bilges 2 in a ship.
  • the bilges 2 are arranged, for example, under the vehicle deck 3 of the ferry 1 and intended to collect in the area of the vehicle deck 3, for example, from vehicles parked there or from liquids seeping into this area further up.
  • the bilges 2 below the vehicle deck 3 are essentially channels which run at predetermined distances from each other in the transverse direction of the hull and connected to suitable pumping devices.
  • the illustrated bilges 2 are of course not the only ones on board the ferry 1, but they can and must be anywhere else, where an accumulation of liquids is to be expected, for example in the engine room, where leakage of fuel, lubricating oil and cooling water is possible to have more bilges installed.
  • the illustrated arrangement of the bilges 2 under the vehicle deck 3 is to be understood as purely exemplary.
  • FIGS. 4 and 5 An enlarged view of a single bilge 2, Fig. 4 in cross section and Fig. 5 in plan view, wherein the position of the visible in Fig. 4 cross-section in Fig. 5 is given by the line AA.
  • Fig. 5 only a short section of the bilge 2 can be seen, the longitudinal center axis is marked by a dash-dotted line.
  • two so-called bilge wells 2A, 2B can be seen at the two side edges of the bilges 2.
  • Bilge wells 2A, 2B are trough-shaped depressions of the bilges 2 whose volume is relatively small, so that even in the presence of a total of only a small amount of liquid in the bilge 2 in the bilge wells 2A, 2B already sets a liquid level of appreciable height , Bilgebrunnen 2A, 2B are particularly well suited for the early detection of fluid accumulation in the Bilge 2, which will occur as a result of a leak in the ship at any point above the installation location of the bilge 2.
  • FIGS. 4 and 5 left-hand bilge wells 2A, the installation of a sensor according to the invention in the form of an optical waveguide 4 for the detection of a liquid accumulation is indicated.
  • a sensor can be provided in all bilge wells, that is to say, for example, in the right-hand bilge fountain 2B in FIGS. 4 and 5.
  • the sensor according to the invention will be described below with reference to the left-hand bilge fountain 2A of the figures
  • an optical waveguide 4 preferably in the form of a glass fiber cable, is used to measure the liquid level in the bilge fountain 2A, with which a temperature measurement is actually carried out. From the temperature is then closed to the liquid level.
  • the optical waveguide 4 is via an optical directional coupler
  • the directional coupler 5 couples in light emitted by the light source 6 into the optical waveguide 4 and out of this backscattered light to the signal processing device 7.
  • the signal processing device 7 is followed by a display unit 8.
  • a multiplicity of Bragg gratings with mutually different grating periods are formed therein at predetermined positions.
  • three such Bragg gratings 9A, 9B and 9C are shown in FIG.
  • the optical fiber 4 is inserted into a thin-walled pipe 10 made of metal or plastic, which is arranged vertically in the bilge fountain 2A.
  • a liquid 11 is present in the Bilgebrunnen 2A.
  • One Part of the optical waveguide 4 is located below the liquid level 12 of the liquid 11. Consequently, some of the Bragg gratings 9A, 9B and 9C are also below the liquid level 12. In the example shown, this is only the Bragg grating 9C.
  • a heating device 13 is also arranged, which is supplied by a power source 14.
  • the heater 13 may be a heating wire attached along the inner wall of the tube 10.
  • the energy source 14 can be activated by the signal processing device 7, which will be discussed in more detail later. Upon activation of the energy source 14, the heater 13 heats the optical waveguide 4 uniformly along its entire length.
  • FIG. 7 shows an enlarged schematic representation of a section of the optical waveguide 4 consisting of a core 4K and a cladding 4M, specifically of a section in which a Bragg grating 9A, 9B or 9C is formed.
  • This consists of a periodic sequence of disk-shaped regions which have a refractive index ni deviating from the normal refractive index n2 of the core 4K.
  • the period of the grating 9A, 9B or 9C is indicated by d in FIG.
  • a local temperature change of the optical waveguide 4 in the region of a Bragg grating 9A, 9B or 9C leads to a local length expansion or contraction and thus to a change of the grating period d, resulting in a shift of the spectral intensity distribution 16A, 16B or 16C of the backscattered light Has.
  • the extent of this shift is a measure of the change in length and thus the change in temperature.
  • the signal processing device 7 provided in the measuring arrangement of FIG. 6 contains a spectral analyzer for determining the spectral distribution of the light backscattered by the individual Bragg gratings 9A, 9B and 9C and a computing device which determines the extent of the respective displacement relative to a reference position and in a temperature change compared to a reference temperature at which the spectral distribution has the reference position, converted. This is done for each individual Bragg grating 9A, 9B and 9C, so that in this way the distribution of the temperature along the entire optical waveguide 4 is obtained.
  • the computing device of the signal processing device 7 determines the position of this stage and assigns it from the known positions of the Bragg gratings 9A, 9B and 9C along the optical waveguide 4 and its known arrangement within the Bilgebrunnens 2A ne vertical position with respect to the Bilgebrunnens 2A, the is output as liquid level on the display unit 8.
  • the heater 13 is not needed in this case and therefore remains out of service.
  • the power source 14 is activated and gives power to the heater 13, resulting in a heating of the optical waveguide 4 relative to its surroundings.
  • the liquid 11 dissipates the heat output from the tube 10 much better than the air 17 above the liquid level 12, so that even in this case a temperature level results at the level of the liquid level 12 in this case, the temperature below the liquid level is lower than above.
  • the position of the temperature level is determined by the computing device of the signal processing device 7 and converted as described above in a measure of the liquid level and output to the display unit 8. It goes without saying that the function of the measuring arrangement according to the invention does not depend on the type of liquid contained in the bilge fountain 2A, but in principle a bilge fountain 2A with any liquid content can be monitored. Whether or not use should be made of the heating device 13 depends on whether the expected temperature of the liquid 11 deviates from the ambient temperature or not.
  • the configuration shown in FIG. 6 with three Bragg gratings 9A, 9B and 9C, ie three measuring points along the height of the bilge fountain 2A, is common but not necessary. Depending on the desired measurement accuracy, more or less than three Bragg gratings 9A, 9B and 9C may also be provided.
  • the temperature of the liquid contained in the bilge fountain 2A is not of interest, its absolute value for the measurement does not play a decisive role, i. There are no high accuracy requirements for the calibration or no need for a reference measurement with an additional temperature sensor. Basically, however, a simultaneous temperature detection is possible, since the measurement effect is based on a temperature change and it is only closed on the liquid level.
  • the display unit 8 can also be equipped with visual and / or acoustic alarms, which make the ship's crew actively aware of a fluid level above a predetermined threshold, which is indicative of the presence of a leak, in order to detect and correct leaks early to enable.
  • FIG. 10 three bilge wells 2A, 2B and 2C are shown in FIG. 10, in each of which an optical waveguide 4A, 4B or 4C is arranged as a liquid sensor.
  • Each of the optical waveguides 4A, 4B and 4C is connected to an optical directional coupler 18A, 18B and 18C, respectively.
  • the directional couplers 18A, 18B and 18C are connected in series via optical waveguides 19A, 19B, 20A and 20B, that of the
  • the light backscattered at the Bragg gratings of the optical waveguides 4C and 4B is returned via the directional couplers 18C and 18B and the optical waveguides 20B and 20A to the directional coupler 18A and from there to the signal processing device 7.
  • the optical fibers 19A, 19B, 20A and 20B are for transmission only and do not function as sensors, i. they are not equipped with Bragg grids. Only the first directional coupler 18A, to which the sensor of the optical waveguide 4A is connected, like the directional coupler 5 in FIG. 6, is connected directly to the light source 6 and to the signal processing device 7.
  • the signal processing unit 7 is connected to a display unit 8 as before.
  • the number of three bilge wells 2A, 2B and 2C in Fig. 10 is meant to be purely exemplary. Also, more than three bilge wells may be monitored according to the scheme shown in Figure 10, i. the further bilge wells in each case assigned as sensors optical waveguides can be connected by further directional coupler and by further optical waveguides which act as pure transmission lines to the measuring device, which contains only a single light source 6, a single signal processing device 7 and a single display unit 8. As can readily be seen from FIG. 10, this is a serial wiring of the individual optical waveguides 4A, 4B and 4C acting as sensors, which manages with a minimum of cable length.
  • the number of bilge fountains that can be wired in the manner shown in FIG. 10 is essentially limited only by the bandwidth that must be provided per Bragg grating to spectrally separate the signals backscattered from the individual Bragg gratings.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un dispositif de détection de fuite sur un navire, lequel dispositif est constitué d'au moins un capteur placé dans ou sur un fond de cale et d'un dispositif de traitement de signal, associé audit capteur et dérivant d'un signal émis par le capteur au moins un signal indiquant le niveau de liquide dans le fond de cale. Le capteur se compose d'un guide d'ondes optiques (4), le long duquel une pluralité de réseaux de Bragg (9A, 9B, 9C) de périodes différentes sont formés en des points prédéterminés. Une source de lumière (6) appropriée permet de faire entrer de la lumière dans le guide d'ondes optiques. Le dispositif de traitement de signal (7) comprend un analyseur destiné à déterminer la composition spectrale de la lumière rétrodiffusée au niveau des réseaux de Bragg (9A, 9B, 9C) et un dispositif de calcul destiné à évaluer cette composition spectrale. Le guide d'ondes optiques est placé dans le fond de cale, de sorte que le nombre de réseaux de Bragg (9C) qui se trouvent en dessous du niveau (12) d'un liquide (11) contenu dans le fond de cale (2) dépend du niveau de liquide dans le fond de cale (2).
PCT/EP2009/052704 2008-03-18 2009-03-09 Dispositif de détection de fuite sur un navire Ceased WO2009115418A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES09721552.9T ES2525131T3 (es) 2008-03-18 2009-03-09 Dispositivo para reconocer fugas en un barco
EP09721552.9A EP2255163B1 (fr) 2008-03-18 2009-03-09 Dispositif de détection de fuite sur un navire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008014739.7 2008-03-18
DE102008014739A DE102008014739B3 (de) 2008-03-18 2008-03-18 Vorrichtung zur Leckageerkennung auf einem Schiff

Publications (1)

Publication Number Publication Date
WO2009115418A1 true WO2009115418A1 (fr) 2009-09-24

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Application Number Title Priority Date Filing Date
PCT/EP2009/052704 Ceased WO2009115418A1 (fr) 2008-03-18 2009-03-09 Dispositif de détection de fuite sur un navire

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